Stop-motion for looms.



No. 683,491. Patented Oct. I, |90I.

F. PICK. v

sToP moTlon Fon Looms.

(Application med June 9, 1899.)

(No Model.)

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UNITED STATES PATENT v OFFICE.

FRIEDRICH PICK, OF VIENNA, AUSTRIA-HUNGARY.

STOP-MOTION FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 683,491, dated October 1, 1901.

Application tiled June 9, 1899. Serial No. 719,951. @To model.)

T all whom t may concern:

Be it known that I, FRTEDEIOH PK, manufacturer, a citizen of the Empire of Austria- `IIungary, residing at Vienna, Austria-Hungary, have invented certain new and useful Improvements in Stop-Motions for Looms, of

' which the following is a specication.

' more easily intelligible, reference is had to the accompanying drawings, in which similar numerals of reference denote similar parts throughout the several views.

Figure l is a diagram showing the position of the sheaf or bar in the socket of the metal wire when the warp-threads are whole, and Fig. 2 is a similar diagram showing the position of the bar when the warp-thread is broken. Fig. 3 is a diagram of the electromagnetic stop-motion, and Fig. 4 shows the connection of the heddle-wires with a transversal wire leading to the battery.

In the drawings, 5 indicates the heddlewires, having eyes 2, which are larger than the cross-section of the heddle-bars 1. The top edge 4 of the upper heddle-bar is of conducting material, and the other sides of the same are insulated.

6 indicates the lower heddle-bars, and 13 the lower eyes of the heddle-wires.

The heddle-wires are connected to one pole of a battery 9 by means of cross-wires 8 8, Fig. 8, the eyes 2 being connected to the other pole. W'ithin the circuit an electromagnet 14 is arranged, having an armature 16, fast to the spindle of the weft-fork 15, the free end of which is adapted to engage the reciprocating warp stopping-lever 17 when the armature is attracted.

The device operates in the following manner: Since the internal Width of the eyes 2 of the metal wires 5 of the heddle is somewhat greater than the cross-section of the bar 1,'

the thread should break during depression or should be depressed after breakage, no upward pressure can be exerted on the heddlewire in connection with it, and consequently the separation of the eye 2 from the upper edge of the bar l cannot occur, so that the loop rests on its bar just as it would do when the top part of the shed is raised. The same action will take place if one of the warpthreads becomes slack. Now, since all the wires 5 of one heddle are connected to one of the poles of an electric source 9 and the upper bar 1 thereof` is connected to the other pole of the source of electricity, it will be evident that if the bar has a conducting-surface along its upper edge 4 and is otherwise insulated the circuit may be closed between the wire loops 2 and the heddle-bar only when one set of threads is raised into the upper sheaf, or, also, if one of the Warp-threads breaks when the sheaf and thread corresponding to the same are lowered. If it be desired to eect the closing of the circuit only at the breaking of a thread, it will be necessary to prevent the closing of the circuit lby the raising of the bar and only allow it to take place in the manner described when the thread breaks or when it becomes too slack, Fig. 2.

In order to prevent the closing of the circuit through the raising of the bar, a contact device is interpolated in the circuit, whereby the latter is opened or interrupted at the raising of the bar, but closed at the lowering of the same, or, in other words, circuit-closing between the eyes of the heddle-Wires and the corresponding bar can only occur at the lowering of that bar and is thus dependent on such movement. As above mentioned, the eyes 2 of the wires 5 are somewhat longer than ordinarily, and they are of sufcient internal width to allow for easy play on the bars, which,with the exception of their upper edge 4, are covered with insulating material 7, the upper interior surface 3 of the socket being of conducting material.

The heddle-wires 5 are advantageously connected to the source of electricity by means of a metallic wire 8, Fig. 4, inserted between the-various wires in the manner of a weftthread, this latter being' attached by one end to one of the poles of a battery, an electromagnet 14 being interposed in the open cir- IOO cuit thus formed for use in connection with the stop-motion. Y A

The necessary completion of the circuit may advantageously take place by means of the treadle 10, which is adapted to press a contact-spring 12 onto a stationary'contact 11. Furthermore, instead of forming contacts at the breaking of the threads between the upper edge 4L of, the upper bar 1 and the upper interior surface 3 of the eye 2 the lower bar may be arranged in the same manner to make contact with the upper interior surface of the lower eye 13 when one of the top warps breaks, as will be readily understood. The breaking or the slackening of a thread then causes its wires at the next lowering of the under shed to close the circuit from the battery 9, energizing the electromagnet 14 and attracting the armature 16. Since the arm of the armature 16 is keyed to the spindle of the weftfork 15, the left end of the same will be depressed if the weft is broken or loose and comes within reach of the oscillating lever 17, which it operates to stop the loop in the well-known manner. This arrangement is entirely independent of the number of heddles, because the wires of each heddle with the contact arrangement for closing the circ uit in, connection with the electromagnet adapted to act on the stop-motion either form an open or closed circuit, according to the circumstances, thus forming as many parallel lines or circuits as there are healds.

I claim as my invention- In an electromagnetic warp stop -motion for looms havingheddle-bars and heddlewires with eyes of greater diameter than the said bars, the combination of a source of electricity, a bar extending through the said eyes to connect one pole to the said wires, a contact mounted beneath the heddle-bars and means foi` connecting the other pole to the same, said contact being broken when the bar is raised and closed when it is lowered, the circuit bein g closed on the breakage of a warp-thread by the operation of the contact and the impingement of the bar against the upper part of the eye, substantially as described.

In Witness whereof I have hereunto signed my name, this 20th day of May, 1899, in the presence of two subscribing Witnesses.

FRIEDRICH PICK.

Vit-nesses:

ALvEsro S. HOGUE, AUGUST FUGGER. 

